General wall distance functions

[AdelekeBankole]

No description provided.

[jedbrown]

• Create a CeedQFunction to evaluate $\nabla v \cdot \nabla \phi - v 1$.
• Create a CeedOperator for dmDist
• Solve using -snes_fd_color (won't be efficient)
• Port multigrid from examples/petsc/multigrid.c to make it efficient
• Given solution $\phi$, compute distance $d = \sqrt{\lVert \nabla \phi \rVert^2 + 2\phi} - \lVert \nabla \phi \rVert$.
• Visualize $d$ field and compare with analytic distance

[AdelekeBankole]

@jedbrown, I am doing the substraction in here CeedQFunctionCreateInterior(ceed, dim, DistanceFunction - Mass_N, DistanceFunction_loc, &qf_distance_function); because this is what I want to do $F (\phi ) = A \phi - M 1$
Does this make sense?